Hub-boring machine.



No. 832,415. PATENTED 00T. 2, 1906. F. W. & G. H. PRICE. HUB BORING MACHINE.

APPLIOATION FILED SEPT. 6. 1905.

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No. 832,415. PATENTED OCT. 2, 1906. F. W. n C. H'. PRICE.

HUB BORING MACHINE.

APPLICATION FILED SEPT. 6.1905.

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UNITED sTATEs PATENT oEEICE.

FRANK W. PRICE AND CHARLES H. PRICE, OF -FINLEYVILLE PENN- SYLVANIA.

HUB-BORING MACHINE.

Specification of Letters Patent.

Patented Oct. 32, 1906.

To all whom t may concern:

Be it known that we, FRANK W. PRICE and CHARLES H. PRICE, citizens of the United States of America, residing at Finleyville, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Hub-Boring Machines, of which the following is a specification, reference beinghad therein to the accompanying drawings. l

rl`he invention relates to new and useful improvement in hub-boring machines.

The primary object of the present invention is to provide means for automatically stopping the machine when the bore inv the hub shall have been drilled a predetermined length.

To the furtherance of this object the invention comprises a suitable support upon which are mounted concentrically-disposed shafts, one shaft serving as a feed-shaft for the bit and the other shaft being adapted to carry a wheel-holder to hold the wheel the hub of `which is to be drilled. f

vwhich like characters of reference designate corresponding parts throughout the several views, in which- Figure 1 1s a side elevation of our Improved machine. Fig. 2 Isla longitudinal sectional `view thereof, showing the relative arrangement of the parts in their assembled position. Fig. 3 Isl a top plan view thereof. Fig. 4 is a detail side elevation of a novel form of bit em'- ployed. Fig. 5 is a similar view taken at a right angle to Fig. 4. Fig. .6 is a perspective view of a modified form of bit. Fig. 7 is a front elevation of a self-centering hub-holder. Fig. 8 is a front elevation of a portion of the wheel-holder, showing the manner in which the wheel is held upon the machine. Figs. 9 and 10 are detail views of the wheel-holder..

Referring specifically to the drawings, the invention comprises a bed A, upon which is mounted a block B, coasting with said bed for supporting the machine. A hollow tubular bearing 1 is mounted upon the block B -and is-:held thereon .by means of straps 2,

which straddle said bearing and block. B and are secured to the bed A. Mounted upon the bed A in the rear of said block B is a U- shaped bracket 3, which is formed with superposedaxially-alined openings or bearings 4 in the legs thereof. A longitudinal shaft 6 is journaled in the lower set of bearings 4 and extends through the bearing 1. f The shaft 6 is formed with a threaded portion 7, which is threaded into one of said bearings 4, preferably the inner one, said shaft carrying at its end a bit 8 of peculiar construction, to be hereinafter described. A hollow shaft 9 is also journaled in the bearing 1 and surrounds said shaft 6. The shaft 9 carries at one end a pinion 10, whi chis rigidly mounted thereupon and the side of which abuts the confronting face of the bearing 1, being relieved offriction in movement by antifriction-rollers 11. The'shaft 9 has mounted upon its outer end or otherwise secured thereto a collar 12, upon which is mounted a frame forsupporting the wheel. This frame yis of substantially open conical shape and embodies a plurality of inclined-radially-extending bars `13, which are secured at their ends to a rim or annulus 14. The rim or annulus 14 is formed with threaded openings 14a, arranged atregular intervals, in which are secured the wheel-holding devices which may consist4 either of a hook 45, embracing the spokes of the wheel, as shown in Fig. 8, or of a T-shaped member 46,.which has its horizontal arm arranged on the exterior of a pair of ad'acentspokes, as shown in the same figure. t is of course only necessary to employ half as many members 46 for holding the wheel as the kmembers 45,: and it is to benoted that the members 45 and 46 spectively, which extend through said'openings 14a.

A pair of oppositely-disposed L-shaped brackets 15 have their ends secured to the respective bars 13 and to the rim 14. These brackets 15 are formed with axially-alined openings, in which are loosely mounted the connecting-rods 16 of the self-centering workholder, embodying a `set of toggle-links 17,

at their ends and preferably four in. number. These toggle-links are shown in detail in Fig. 7 and. are formed with concave sides 18 and with convex sides 19, so that theymay be reversed to assume the position in dotted lines are formed with threaded shanks147 47 rehaving pivotal connection With one another without need of further adjustment when it is desired to have a small center` The adjustment of the links 16 with relation to the toggles 17 is effected by means of nuts 20, mounted upon the end of said links, said nuts performing the dual function of maintaining said links in their position in the brackets and of adjusting said links to vary the size of the centerin device.

The end of the collar 12 to which the work- Y end a pinion 24, provided with a handle 25,

Vthe shaft 23. arranged to lie in the same plane and are posithe purpose of which will hereinafter appear. The shaft 23 is adapted under certain conditions to have a limited slidable movement in its bearings 4, but is held in normal position by an expansive spiral spring 23a, mounted on the outer end thereof and interposed between the bracket 3 and a pin 26, mounted in the end of said shaft, which limits the slidable movement thereof. A sprocket 27 is mounted upon the shaft 6, being secured thereto in such a manner as to rotate therewith. Said sprocket 27 is connected by a chain 28 with a sprocket 29, preferably of the same size, which is slidably mounted upon The sprockets 27 and 29 are tively held therein by virtue of connectingstraps 30, said straps 30 having their central portions secured together by rivets or other desired means, as at 32. The spaced parallel ends 31 of said straps 30 straddle the sprocketwheels 27 and 29 and serve as guides for the latter in its sliding movement along the shaft 23. We have stated that the sprocket 29 is slidably mounted upon the shaft 23, but it is desired that the shaft 23 should rotate with and be rotated by said sprocket 29 and the operation of the machine. This is effected by means of the rectangular or squared crosssectional contour of said shaft 23, said shaft extending through an opening of corresponding contour in said sprocket 29.

In the course of the operation of the machine it is desired that one of the legs 31 of the respective straps 30 should engage means rigid upon the shaft 23 to throw the pinion 24 thereupon out of gear with the pinion 10. This' means is provided in a collar 33, which is adjustably mounted upon the shaft 23, being set in position by means of a set-screw 34. The pinions 24 and 10 are normally in mesh, so as to transmit rotary motion from the shaft 9 to the shaft 23 and again by means of the sprocket-gearing to the shaft 6.

In connection with an Vapparatus constructed as above and designed for the purpose set forth we employ a novel form of bit, which is illustrated in Figs. 4 and 5 and of which a modification is shown in Fig. 6. The bit 35 is formed with a straight edge 36 and is provided on its opposite edge with curved pointed teeth 37, arranged at regular intervals. The bits 35 are of wedge-shaped contour and are mounted in pairs upon a tapered head 38. Each head is integral with the end of the shaft 6. The wedge-shaped contour' of the bits 35, as well as the tapering form of the head 38, give to the bore formed in the hub a substantially conical shape,whichis employed in hubs of conventional form. It is to be noted that the bits 35 are mounted in pairs upon the head 38 and are disposed on opposite faces thereof in such a manner that the teeth 37 will extend in opposite directions. When it is necessary to adjust the dimensions of the bit in accordance with the size of the bore to be drilled in the hub, we perform` this function by moving the bits 35 laterally a very slight distance in either direction. For this purpose we have provided said bits, adjacent the ends thereof, with transverse elongated slots 39, through which extend securing screws or bolts 40, which may be tightened 'or loosened at will. In Fig. 6 the bit is provided with a series of teeth which are arranged in pairs at regular intervals. The forward toothl of each pair (designated 41) is pointed and serves to cut through the Wood as the bit-head rotates. The rear tooth of the pair 42 is formed with a sharp edge 44, the edge 44 serving to still further cut into the surface of the wood.

ln operation a wheel is placed concentric- IOO IIS

It is to be noted that while the direction of travel of the shafts 23 and 6 will be the same such direction of travel will be opposite to the direction of travel of the shaft 9, owing to the operation of the interposed gears 10 and 24. As the shaft 6 is rotated its threaded -surface 7 will feed the same through the bearmoving the collar 33 a corresponding length on the shaft 23 and setting the same rigidly upon said shaft by means of the set-screw 34. As the shaft 6 feeds outwardly toward the hub it will carry therewith the sprocket 27 and the connecting-straps 30, so that sliding motion will be transmitted to the sprocket 29 during the rotation of the latter. The sliding and rotary movement of the sprocket 29 is continued until the leg 31 of the strap 30 adjacent said sprocket engages the collar 33, at which time the shaft 23 will be moved outwardly in its bearings 4 by the sliding sprocket-gears until the pinion 24, mounted upon the end thereof, is out of mesh with the pinion 10 and assumes the position shown in dotted lines in Fig.1. When this stage in the operation has been reached, there will be no means for transmitting the motion of the shaft 9, which is still in rotation. Hence the shaft 6 will cease rotating, thereby stopping the movement of the bit. The drilling operation having been thus completed and automatically stopped, the bit is fed inwardly out of the hub-box by rotating the pinion 24 manually'by the handle 25 in a direction of travel opposite to that assumed in the drilling operation. This will cause the shaft 6 to feed rearwardly and placethe machine in readiness for another operation.

It is apparent that various minor changes may be made, as in the form of bits, the form `of self-centering work-holder, as well as the arrangement and form of gears employed. In addition to the means for manually operating the machine it is obvious that connection may be employed for operating the rim 14 and the pinion 24 from a suitable motor by the addition of various mechanisms.

The changes outlined and changes of similar character may be made without departing from the scope of the invention as dened in the appended claims.

Having fully described our invention, what we claim, and desire to secure by Letters Patent, i's- 1. In a boring-machine, the combination of a work-holder, a hollow shaft rigidly secured to said work-holder, with a bit-shaft extending through said hollow shaft, powertransmitting mechanism connecting the hollow shaft with the bit-shaft, said mechanism r being constructed and arranged so as to impart movement in opposite directions to the said shafts, means for feeding the bit-shaft toward the work-holder and means for automatically disconnecting said hollow shaft and said bit-shaft after a predetermined number of revolutions of said shaft comprising a longitudinally-movable shaft above and parallel to the bit-shaft, a sprocket- Wheel slidably mounted on said longitudinally-movable shaft, a sprocket-wheel on said bitshaft, a chain connecting said sprocket-wheels, and a stop on said longitudinally-movable shaft adapted to be struck by the sprocket-wheel on said shaft.

2. In a boring-machine, the combination with a work-holder, and a hollow shaft secured thereto, of a bit shaft extending through said hollow shaft, a pinion on said hollow shaft, a longitudinally-movable shaft supported above and parallel to said bit-shaft, a sprocket-wheel on said bit-shaft, a sprocketwheel on said upper shaft, a chain connecting 'said sprocket-wheels, a gear-wheel on said upper shaft adapted to mesh with said pinion, an adjustable stop device on said upper shaft adapted to be engaged by the sprocket-wheel of said upper shaft.

3. In a boring-machine, the combination with a bed, a block mounted on said bed, a hollow tubular bearing mounted on said block, and a U-shaped bracket mounted on said bed and provided with two sets of bearings, of a hollow shaft arranged in said tubular bearing, a work-holder carried by said hollow shaft, a pinion carried by said hollow shaft, a bit-shaft mounted in said bracket and extending through said hollow shaft a second shaft carried by said bracket, a gearwheel carried by said second shaft and meshing with the pinion on the hollow shaft, a sprocket-wheel carried on said bit-shaft, a sprocket-wheel slidably' mounted on said second shaft turning therewith, a chain connecting said sprocket-wheels, a collar adjustably mounted on said second shaft, said second shaft being longitudinally movable in its bearings and adapted to be moved longitudinally so as to disconnect the gear-wheel thereon from the pinion on the hollow shaft, when the sliding sprocket-wheel contacts with said collar.

In testimony whereof we aflix our signatures in the presence of two witnesses.

FRANK W. PRICE. CHARLES H. PRICE.

Witnesses: X

JOHN S. PowERs, C. MosTERMoRNN.

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